package com.steam.org.service.impl;

import com.steam.basic.service.impl.BaseServiceImpl;
import com.steam.org.domain.Department;
import com.steam.org.mapper.DepartmentMapper;
import com.steam.org.service.IDepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements IDepartmentService {

    @Autowired
    private DepartmentMapper departmentMapper;

    //部门树
    @Override
    public List<Department> deptTree() {
        List<Department> all = departmentMapper.loadAll();
        Map<Long, Department> map = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(), department);
        }

        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department : all) {
            if (department.getParent_id() == null) {//顶级部门
                deptTree.add(department);
            } else {//不是顶级部门
                //1.想办法找到当前部门的 父部门
                Long parent_id = department.getParent_id();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.loadById(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                if (parentDepartment != null){
                    //2.将自己装到  父部门 的children中
                    parentDepartment.getChildren().add(department);
                }
            }
        }
        return deptTree;
    }

}
